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Tandem Diabetes Care
TNDM

272 hedge funds and large institutions have $1.51B invested in Tandem Diabetes Care in 2026 Q1 according to their latest regulatory filings, with 45 funds opening new positions, 94 increasing their positions, 93 reducing their positions, and 35 closing their positions.

New
Increased
Maintained
Reduced
Closed

1,139% more call options, than puts

Call options by funds: $108M | Put options by funds: $8.7M

29% more first-time investments, than exits

New positions opened: 45 | Existing positions closed: 35

4.68% more ownership

Funds ownership: 110.44% → 115.12% (+4.7%)

1% more funds holding

Funds holding: 268 → 272 (+4)

1% more repeat investments, than reductions

Existing positions increased: 94 | Existing positions reduced: 93

8% less capital invested

Capital invested by funds: $1.65B → $1.51B (-$138M)

67% less funds holding in top 10

Funds holding in top 10: 3 → 1 (-2)

Holders
272
Holders Change
+4
Holders Change %
+1.49%
% of All Funds
3.35%
Holding in Top 10
1
Holding in Top 10 Change
-2
Holding in Top 10 Change %
-66.67%
% of All Funds
0.01%
New
45
Increased
94
Reduced
93
Closed
35
Calls
$108M
Puts
$8.7M
Net Calls
+$99.1M
Net Calls Change
+$41.9M

Top Buyers

1
UBS Group
UBS Group
Switzerland
+$35.4M
2
Wellington Management Group
Wellington Management Group
Massachusetts
+$20.5M
3
SCM
Soleus Capital Management
Connecticut
+$17M
4
DCM
Defilade Capital Management
California
+$16.6M
5
DCM
Driehaus Capital Management
Illinois
+$15.1M

Top Sellers

1
Assenagon Asset Management
Assenagon Asset Management
Luxembourg
-$22.8M
2
BNP Paribas Financial Markets
BNP Paribas Financial Markets
France
-$22.6M
3
Morgan Stanley
Morgan Stanley
New York
-$15.7M
4
Barclays
Barclays
United Kingdom
-$10.8M
5
BlackRock
BlackRock
New York
-$9.96M
Name Holding Trade Value Shares
Change 		Change in
Stake
DCM
26
Defilade Capital Management
California
$14.6M +$16.6M +761,905 New
Millennium Management
27
Millennium Management
New York
$14.6M +$3.87M +178,099 +31%
Fidelity Investments
28
Fidelity Investments
Massachusetts
$13.7M +$899K +41,364 +6%
Northern Trust
29
Northern Trust
Illinois
$13.5M +$324K +14,916 +2%
RA
30
Royce & Associates
New York
$13.4M +$1.01M +46,340 +7%
QCM
31
Quantinno Capital Management
New York
$12.5M +$7.85M +361,361 +124%
Charles Schwab
32
Charles Schwab
California
$12.3M -$80.7K -3,712 -0.6%
ECM
33
ExodusPoint Capital Management
New York
$12.1M +$13.8M +632,899 New
Holocene Advisors
34
Holocene Advisors
New York
$9.15M +$10M +460,941 +2,808%
VFT
35
Vanguard Fiduciary Trust
Pennsylvania
$9.04M +$10.2M +471,658 New
Aberdeen Group
36
Aberdeen Group
United Kingdom
$8.32M -$2.46M -113,008 -21%
Barclays
37
Barclays
United Kingdom
$8.08M -$10.8M -496,691 -54%
Point72 Asset Management
38
Point72 Asset Management
Connecticut
$8.06M +$9.14M +420,478 New
FCM
39
Frontier Capital Management
Massachusetts
$7.61M -$327K -15,060 -4%
Bank of America
40
Bank of America
North Carolina
$7.15M -$7.15M -329,279 -47%
N
41
Nuveen
North Carolina
$6.97M -$4.33M -199,472 -35%
JP Morgan Chase
42
JP Morgan Chase
New York
$6.85M +$177K +8,161 +2%
DCM
43
DAFNA Capital Management
California
$6.81M – – –
First Trust Advisors
44
First Trust Advisors
Illinois
$6.57M +$7.45M +342,707 New
Bank of New York Mellon
45
Bank of New York Mellon
New York
$6.45M -$293K -13,462 -4%
AQR Capital Management
46
AQR Capital Management
Connecticut
$6.36M -$167K -7,663 -2%
Principal Financial Group
47
Principal Financial Group
Iowa
$6.36M +$158K +7,279 +2%
Invesco
48
Invesco
Georgia
$5.64M +$355K +16,330 +6%
Acadian Asset Management
49
Acadian Asset Management
Massachusetts
$5.32M -$2.49M -114,647 -29%
SGA
50
Sector Gamma AS
Norway
$5.12M – – –
1
2
3 4 5

TNDM Hedge Fund Activity: Q1 2026 in Review

272 of the 8,126 institutional investors tracked by Wall St. Rank reported a position in Tandem Diabetes Care (TNDM) for Q1 2026, worth a combined $1.51B — down 8.4% from $1.65B a quarter earlier.

Buyers outnumbered sellers: 45 funds opened new TNDM positions and 35 closed out — a net gain of 10 holders — while 94 added to existing stakes and 93 trimmed.

The largest buyer was UBS Group, adding an estimated $35.4M. The largest seller was Assenagon Asset Management, cutting an estimated $22.8M.

  • 272 institutional investors held Tandem Diabetes Care (TNDM) as of Q1 2026, up from 268 in Q4 2025.
  • Funds reported $1.51B of Tandem Diabetes Care stock for Q1 2026, down 8.4% quarter-over-quarter.
  • 45 funds opened new Tandem Diabetes Care positions in Q1 2026 and 35 closed out, a net change of +10 holders.
  • The largest Tandem Diabetes Care buyer in Q1 2026 was UBS Group, an estimated $35.4M added.
  • The largest Tandem Diabetes Care seller in Q1 2026 was Assenagon Asset Management, an estimated $22.8M sold.

Based on aggregated 13F filings for Q1 2026.